Combined anvil and driftpin



Aug. l1, 1942. M. HoKANsoN COMBINED- ANVIT.. AND DRIFT PIN l t e e h s S t e e h s 2 Filed sept. 25, 1959 Allg- 11, 1942- M. HoKANsoN 2,292,520

COMBINED ANVIL AND DRIFTv PIN Filed Sept. 25, 1939 2 sheets-sheet 2 Y i ,I IgVENTOR. i

AT'FORNEY. l

Patented Aug. 11, 1942 COMBINED ANVIL AND DRIFTPIN Martin Hokansen, Duluth, Minn., assignor yto Eidco, Incorporated, Duluth, Minn., a corporation of Minnesota Application September Z5, 1939, Serial No. 296,448

(Cl. Ztl-86.1)

3 Claims.

This invention relates to a combination anvil and drift pin, particularly adapted for use in separating the frictionally united members of rock drilling equipment.

The principal object of the invention is to provide as simple and convenient an assembly of this character as possible.

Other objects and advantages of the invention will appear in the following description thereof.

Referring now to the accompanying drawings, forming part of this application, and wherein like reference characters indicate like parts:

Figure 1 is a combined elevation and sectional view of one of the units.

Figure 2 is a reduced elevation taken at right angles to Figure 1.

Figure 3 is an elevation of one of the insert flat members of the anvil.

Figure 4 is a plan view of a modied form of anvil for use upon a column support.

Figure 5 is a side elevation of Figure 4.

Figure 6 is a reduced perspective View of a spigot and socket assembly of drilling members.

Referring now to the drawings, attention is rst directed to Figure 6 illustrating a form of rock drill in which I represents the drill head and 2 the end of the drill rod which is attached to the head as by a spigot and socket connection, the socket being illustrated at 3 in the shank of the drill head and 4 represents the spigot on the end of the drill rod. An enlarged portion is indicated adjacent the end Iof the `drill rod, said enlarged portion being provided with opposite flattened and inclined surfaces indicated at 5, intermediate of which and the flat terminus of the shank of the drillhead a U-shaped wedge is employed in separating one from the other.

Means for the separation of such an assembly 'of drilling members is especially essential since improvements in same have recently become familiar in the art and wherein a friction joint of this type is provided with knurled surfaces which greatly enhances' the ei'iciency of same, thus requiring more forcible means for separating the parts.

In Figures 1 and 2 is illustrated at 6 a U-shaped wedge such as employed during the separation of such a friction joint, and which wedge is provided on one face thereof with stepped channels as indicated at 'I for registration with said inclined surfaces 5, or the like, so that when forcibly driven between such inclined surfaces and the opposed surface, the desired wedging or separating eifect will result. However the wedge in these two views is illustrated as being assembled within an anvil, the opposed spaced walls of which are illustrated at 8 and 9, and transverse the top of which opposed walls is positioned a drift pin ID which is straddled by the wedge` 6, with the bifurcated portions of the latter extending within the space intermediate of the 'side walls 8 and 9 of the anvil. This pin is essential in this assembly in that it is necessary for the complete separation of a drill bit as illustrated in Figure 6 of the drawings, wherein the reaming head I is provided with a central cutting or chisel member, illustrated at II, they being united as by a spigot and socket connection, identical with that shown at 3 and 4, so that when these portions of the drill are separated the drift pin IIJ may be used for such separation. When so used it is quite lobvious that the drill head is placed over the space intermediate of the side walls I and 8 of the anvil, and the small end of the drift pin used in forcing downwardly and into said space within the anvil, the chisel I I.

For cooperation with the parts vof the assembly shown in Figures 1 and 2 the pin Il! is formed with two opposed flattened surfaces indicated at I2, one upon either side thereof, and which fiat surfaces are not materially greater in length than the thickness of the wedge 6, and the larger portion of the drift pin is somewhat greater in diameter than the space intermediate of the bifurcated portions of the Wedge while the flattened`areas are slightly less than such width so that the wedge will span the vdrift pin readily when registering with the attened areas. This registration ofthe pin and wedge is to provide convenient means for the prevention of loss of the pin and its dangling from the assembly, even though it is provided with a tether to prevent the ultimated loss of same from the assembly.

It will be noted that the four corners of the walls 8 and 9 of the anvil are united as by through bolts indicated at i3, and said through bolts are each provided with a pair of spacer rings i4 intermediate of the walls 8 and 9. These spacer rings, united, are less in length than the width of the ultimate space desired intermediate of the walls 8 and 9, which space must be slightly greater than the thickness of the wedge t. This difference `of the combined length of the two spacer rings from that of the ultimate width desired, is just equal to the thickness of the insert bar I5, there being one of these at either side of the anvil and one across the bottom thereof to form a cage-like interior for the anvil. Obviously this cage is for the reception of the chisel members II as they are driven from their respective drill heads so that they do not become lost or fall clear through the anvil resulting in its functioning as a receptacle for same. The insert bars are peculiar in that they are made as simple as possible, having cut-away termini as indicated at I6 which permits of their registration, intermediate of said spacer rings, with their respective holding bolts I3.

It is also believed quite apparent that when the wedge is being used for separating, for example, the rod end and the drill head, they are placed in substantially the same position that the drift pin is shown in Figures 1 and 2 of the drawings, when the wedge is inserted therebetween and driven forcibly downwardly intermediate the walls of the anvil, at which time the latter functions as an admirable support for same and is made sufciently rugged to withstand the blow for such separation.

As a convenient means for conveyance .of the anvil, wedge, and drift pin, I have shown the former as being provided with a pair of baillike handles I1, pivotally attached to the protruding ends of the uppermost corner bolts I3, and which handles are readily thrown apart for manipulation of the other parts of the assembly or drawn together for carrying the device about. To one end of one of the corner bolts I have shown the wedge as being tethered by means of the chain I8, it being Xed to a smaller bail I9 pivotally attached centrally as at 2Q to the upper portion of the wedge. The drift pin IE) is similarly tethered by the washer-like ring 2l and chain 22 to the opposite end of the bolt I3. This washer-like ring 2I is freely rotatable on the smaller end of the drift pin, as the washer 23 is driven firmly upon the tapered knurled portion 24 of the smaller end of the pin, and welded, thus forming a complete and conveniently assembled unit for transportation hither and yon during the use of the unit in drilling operations.

In Figures 4 and 5 I have shown a modification of such an anvil assembly which contemplates the use of a pair of clamping members illustrated at 25 and 26 for convenient use upon a column indicated at 21, which latter is customary about some drilling operations wherein a mast or column is employed. In this assembly the jaw member 25 is provided upon the four corners thereof with lug-like projections 28 each having a hole therethrough for application of a relatively short holding bolt 29. Two of these bolts, on one side of the clamping member, as shown in Figure of the drawings, pivotally carry the links 3S, which may be swung out away from the free corners of the member 25, or drawn in over such corners as shown in Figures 4 and 5 when each is engaged over a lug-like protrusion 3l upon the two corners of the member 26 and there held as by the thumb bolt 32. The short bolts 29 through the lugs 28 upon the opposite side of the two members are engaged each by a pair of short at links 33 which are similarly atached as by short bolts 34 to the lugs 35 on the member 26, thus forming a strong hinge connection of the two members 25 and 26 so that when the U-shaped links 3B are freed from engagement over the projecting lugs 3I of the member 26 the latter may be swung out away from the column and the two jaws readily freed therefrom, or, as is obvious, may be very firmly united with the column and pinched thereagainst by use of the thumb bolts 32 as illustrated, it, of course, being essential that this union be very strong and staunch.

Now the member 25 has formed integral therewith a cylindrical hub-like portion having a groove of slight depth thereabouts adjacent itsA outer extremity as at 4I. Upon this protruding hub-portion 40 is rotatably mounted the square hub 42 of the anvil portion of the assembly, and which latter portion is preferably slightly less in height than that portion surmounting the Y hub 40 and consists of two spaced like anvil membersV 43 intermediate of which the same operations may be performed in the separation of frictionally united drilling members as that performed lon the portable anvil previously described.

The rotatable assembly of the anvil with the column clamping member is accomplished by adjustment of the thumb screw 44 engaging the circumferential groove 4I as when it is slaoked 01T the anvil may be rotated to accommodate any angle at which the members being separated may be. For example, if a drill is to be detached from a drill rod of some considerable length with the opposite end resting on the ground, it would necessitate but a slight tipping of the anvil to accommodate such and allow the wedge to be driven at right angles to the axis of same, which would be desirable in such cases.

Having thus described my invention, what I claim and desire to secure by Letters Patent,

1. A portable device for separating frictionally united members of rock drilling equipment comprising an anvil having spaced rectangular walls for supportingr frictionally united drilling equipment thereon, means holding said walls in spaced relation, and means applicable to and extending between said spacing means about three acljacent sides of said anvil for temporarily holding separated equipment therebetween.

2. A portable device for separating frictionally united members of rock drilling equipment comprising an anvil having spaced rectangular Walls for supporting frictionally united drilling equipment thereon transverse said walls and means holding said walls in spaced relation, and ribs between said walls and extending between said means for temporarily holding separated equipment therebetween.

3. A portable device for separating frictionally united members of rock drilling equipment comprising an anvil having spaced rectangular walls for supporting frictionally united drilling equipment thereon, means at the corners of said walls for holding same in spaced relation, and removable means extending on. three sides between said spacing means for temporarily holding separated equipment between said walls, and whereby any side of said wallsvmay be used as said anvil.

MARTIN HOKANSON. 

